Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Be a better location for a ski run than the south-facing side
Grow a variety of trees that are typically observed at higher elevation
All of these
Have snow on the ground for a longer period of time in winter compared to the south-facing side
Receive less sunlight during a year than the south-facing side

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Environmental Science
The aurora is produced by:

Scattering of sunlight in the upper atmosphere
The combination of molecular and atomic oxygen to form ozone
Reflections of sunlight by polar ice fields
Fast-moving charged particles colliding with air molecules
Burning oxygen caused by the intense sunlight at high altitude

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